AUTOMATIC PEAK BEAM CURRENT LEVELER SYSTEM
    1.
    发明授权
    AUTOMATIC PEAK BEAM CURRENT LEVELER SYSTEM 失效
    自动峰值电流电平系统

    公开(公告)号:EP0041554B1

    公开(公告)日:1987-03-25

    申请号:EP81900158.7

    申请日:1980-10-14

    申请人: MOTOROLA, INC.

    IPC分类号: H04N3/20 H04N5/68

    CPC分类号: H04N5/141

    摘要: A peak beam current leveler for use in a television receiver system which is responsive to the magnitude of the beam current supplied to the cathode of the cathode ray tube (CRT) exceeding a predetermined peak level to adjust the cathode peak beam current accordingly. The cathode beam current is supplied by a gain controlled video amplifier (38) to the cathode through the base-emitter junction of a transistor (56) The collector electrode of the transistor is connected with a resistor (58) for providing a voltage level proportional to the peak beam cathode current. A comparator circuit (70-80) is utilized to provide a gain control signal that controls the gain of the gain controlled video amplifier such that the higher the beam current the more gain reduction that occurs. Thus, the level of the peak current is automatically reduced to maintain good focusing of the display on the CRT.

    VIDEO DRIVER CIRCUIT AND METHOD FOR AUTOMATIC GRAY SCALE ADJUSTMENT AND ELIMINATION OF CONTRAST TRACKING ERRORS
    2.
    发明公开
    VIDEO DRIVER CIRCUIT AND METHOD FOR AUTOMATIC GRAY SCALE ADJUSTMENT AND ELIMINATION OF CONTRAST TRACKING ERRORS 失效
    图象控制电路和方法灰色自动电平控制和对比度跟踪误差处置。

    公开(公告)号:EP0111521A1

    公开(公告)日:1984-06-27

    申请号:EP83901876.0

    申请日:1983-05-02

    申请人: MOTOROLA, INC.

    IPC分类号: H04N5

    CPC分类号: H04N5/57

    摘要: Dispositif (10) et procédé d'établissement automatique du point de fonctionnement d'un tube à rayons cathodiques (CRT) (12), ou d'un niveau de signal à courant continu (noir), ainsi que du contraste, ou du niveau de gain (gris), d'un affichage vidéo par échantillonnage du signal de niveau du CRT (12) des cathodes individuelles (28) et par verrouillage du niveau du signal à courant continu à une référence commune d'établissement à courant continu et du niveau de gain à une valeur déterminée par un signal commun de commande de contraste et de référence de gain. Dispositif (10) et procédé dans lesquels un signal commun de commande de luminosité (44) est modulé par un signal commun de commande de contraste (46) de manière à ajouter un décollement du noir de commande de la luminosité à chaque cheminement de signal vidéo (40) d'un affichage vidéo, empêchant tout changement avec le contraste du niveau du noir de l'image.

    VIDEO DRIVER CIRCUIT AND METHOD FOR AUTOMATIC GRAY SCALE ADJUSTMENT AND ELIMINATION OF CONTRAST TRACKING ERRORS
    3.
    发明授权
    VIDEO DRIVER CIRCUIT AND METHOD FOR AUTOMATIC GRAY SCALE ADJUSTMENT AND ELIMINATION OF CONTRAST TRACKING ERRORS 失效
    图象控制电路和方法灰色自动电平控制和对比度跟踪误差处置。

    公开(公告)号:EP0111521B2

    公开(公告)日:1995-05-10

    申请号:EP83901876.9

    申请日:1983-05-02

    申请人: MOTOROLA, INC.

    IPC分类号: H04N5/18 H04N5/235

    CPC分类号: H04N5/57

    摘要: An apparatus (10) and method for the automatic setup of a CRT (12) operating point, or dc signal level (black), as well as the contrast, or gain level (gray), of a video display by sampling the CRT (12) signal level of the individual cathodes (28) and locking the dc signal level to a common dc setup reference and gain level to a value determined by a common contrast control signal and gain reference. An apparatus (10) and method in which a common brightness control (44) signal is modulated by a common contrast control (46) signal such that a brightness control pedestal is added to each video signal (40) path of a video display whereby picture black level does not change with contrast.

    VIDEO DRIVER CIRCUIT AND METHOD FOR AUTOMATIC GRAY SCALE ADJUSTMENT AND ELIMINATION OF CONTRAST TRACKING ERRORS
    4.
    发明授权
    VIDEO DRIVER CIRCUIT AND METHOD FOR AUTOMATIC GRAY SCALE ADJUSTMENT AND ELIMINATION OF CONTRAST TRACKING ERRORS 失效
    视频驱动电路和自动灰度调整方法调整和消除对比追踪错误

    公开(公告)号:EP0111521B1

    公开(公告)日:1989-08-30

    申请号:EP83901876.9

    申请日:1983-05-02

    申请人: MOTOROLA, INC.

    IPC分类号: H04N5/18 H04N5/235

    CPC分类号: H04N5/57

    摘要: An apparatus (10) and method for the automatic setup of a CRT (12) operating point, or dc signal level (black), as well as the contrast, or gain level (gray), of a video display by sampling the CRT (12) signal level of the individual cathodes (28) and locking the dc signal level to a common dc setup reference and gain level to a value determined by a common contrast control signal and gain reference. An apparatus (10) and method in which a common brightness control (44) signal is modulated by a common contrast control (46) signal such that a brightness control pedestal is added to each video signal (40) path of a video display whereby picture black level does not change with contrast.

    AUTOMATIC PEAK BEAM CURRENT LEVELER SYSTEM
    5.
    发明公开
    AUTOMATIC PEAK BEAM CURRENT LEVELER SYSTEM 失效
    自动电平控制系统SPITZENSTRAHLSTRON。

    公开(公告)号:EP0041554A1

    公开(公告)日:1981-12-16

    申请号:EP81900158.0

    申请日:1980-10-14

    申请人: MOTOROLA, INC.

    IPC分类号: H04N5

    CPC分类号: H04N5/141

    摘要: Un dispositif regulateur du niveau d'un faisceau de courant de crete utilise dans un systeme recepteur de television est sensible a l'intensite du faisceau de courant qui alimente la cathode d'un tube a rayon cathodique (CRT) depassant un niveau de crete predetermine pour ajuster le courant de crete cathodique en consequence. Le faisceau de courant de la cathode est alimente par un amplificateur video a gain commande (38) sur la cathode par l'intermediaire de la jonction base-emetteur d'un transistor (56). L'electrode collectrice du transistor est connectee via une resistance (58) pour fournir un niveau de tension proportionnel au courant de crete de la cathode. Un circuit comparateur (70-80) est utilise pour fournir un signal de commande de gain qui commande le gain de l'amplificateur video a gain commande de sorte que plus le faisceau de courant est eleve plus la reduction de gain est importante. Ainsi, le niveau de courant de crete est automatiquement reduit pour maintenir une bonne focalisation de l'affichage sur le tube a rayon cathodique (CRT).